document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1177288>Question 1177288</A>: <I><SPAN STYLE=\"word-break: break-all;\"> radar detected an unidentified plane 5000 km away, approaching at 700 kph. Fifteen minutes later, an interceptor plane was dispatched, travelling at 800 kph. How long did the interceptor take tp reach the approaching plane? </SPAN>\n" );
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document.write( "radar detected an unidentified plane 5000 km away, approaching at 700 kph.\r<BR>\n" );
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document.write( "In 1/4 hour the plane wouldbe nearer by d= speed * time <BR>\n" );
document.write( "700*1/4 = 175 km\r<BR>\n" );
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document.write( "5000-175 = 4825\r<BR>\n" );
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document.write( " Fifteen minutes later, = 1/4 hour \r<BR>\n" );
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document.write( "an interceptor plane was dispatched, travelling at 800 kph.\r<BR>\n" );
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document.write( "Both planes approaching each other.<BR>\n" );
document.write( "Effective speed = 700+800 =1500 kph\r<BR>\n" );
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document.write( "Distance between them = 4825 km\r<BR>\n" );
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document.write( "time = distance / speed\r<BR>\n" );
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document.write( "= 4825/1500\r<BR>\n" );
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document.write( "= 3.22 hours\r<BR>\n" );
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document.write( " the interceptor take 3.22  hours to reach the approaching plane </SPAN>\n" );
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